O type sealing ring is widely used in GIS. In order to test the aging condition and show the permanent deformation of O type sealing ring

an aging experiment method is designed. Several experiments are conducted based on the method

and experimental results of different temperatures are gathered. At the same time

a data processing method is introduced

and the test results are processed according to the method

and the lifetime prediction values of the seal ring under different temperatures are obtained. According to the experimental research

some conclusions can be obtained such as: the permanent deformation of O type sealing ring is proportional to the aging time and temperature

and the aging progress follow the Arrhenius rule; The working life of O type sealing ring is 2.5 years while the working temperature is 70 ℃. The methods and conclusions from this paper can be used to direct the users of GIS O type sealing ring to estimate the lifetime.